標題:
點dilute 30% alcohol到 20% & 10%
發問:
It is given that a 30% alcohol, describe in details how to dilute the 30% alcohol to 20 % alcohol to 10% alcohol respectively. Thanks you very much!!!
最佳解答:
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always remember the rule: c1 x V1 = c2 x V2 that means, product of concentration and volume before dilution will be equal to that after dilution. for example, the volume of 30% alcohol = V1, then 30% x V1 = 20% x V2 V2 = V1 x (3/2) meaning final volume of dilution will be 3/2 of original volume. the difference in volume, or amount of water added = V2-V1 = 0.5V1 . and then, from 20% to 10%... 20% x V2 = 10% x V3 V3 = 2 x V2 . meaning that final volume should be two times of volume of 20% alcohol. the difference in volume, or amount of water added to dilute 20% alcohol = V3-V2 = V2 .
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